Community repository for 3.6 does not exist?
The community repository for 3.6 gives a 404 error from nginx:
http://dl-1.alpinelinux.org/alpine/edge/community/
This only shows up sometimes, due to the cdn, but can result in inconsistent errors, especially when combined with stable CDN routing.
(from redmine: issue id 7861, created on 2017-09-18, closed on 2017-09-19)